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导波雷达液位计eh

本文章主要介绍了:雷达液位计出现跳变,eh雷达液位计零点设置,导波雷达液位计eh等信息

4)对信号做N点FFT.由于此时信号的等效采样频率为fs/D,所以经过ZoomFFT处理后,选定频谱范围内的谱线间隔为,式中δf为直接对信号x(n)做N点FFT时的谱线间隔.
可见,细化倍数为D的ZoomFFT算法在选定的局部频谱范围内的细化效果与做DN点的补零FFT效果是相同的,但是计算量与运算存储空间差别明显.DN点的补零FFT所需0.5DNlog2(DN)次复乘.细化倍数为D的ZoomFFT总共需要2N+1.5Nlog2N次复乘(低通滤波采用频域相乘IFFT方式).在运算所需存储空间方面,DN点的补零FFT需要预先存储0.5DN个复数旋转因子.ZoomFFT只需要存储0.5N个复数旋转因子,此外还需要提前存储FIR滤波器冲击响应频域特性H(k),所以总共需要存储1.5N个复数.设采样信号点数N=1024,细化倍数D=16,则补零FFT与ZoomFFT算法所需的复乘次数与预先存储的复数量如表1所示,可见ZoomFFT算法的计算量与运算存储空间远小于DN点的补零FFT.
(导波雷达液位计eh)

耐压:40bar(20℃),16bar(200℃)
标准输出:4-20mA/HART
故障输出:22mA
供电:18-35VDC
外壳材料:铸铝环氧涂层
防护等级:NEMA4(IP65)
防爆:ATEXII1G或II1/2DT100℃
EEXiaIICT6...T3或EEXiaIIBT6...T3
重量:1.5Kg(无探头)
(导波雷达液位计eh)

雷达物位计(RadarLevelMeter)中的雷达是英文RadioDetectionandRaging(无线电检测与测距)首字母的缩写词,由于是向被测目标发射微波来计算物位距离,因此又被称为微波物位计。超声波液位计与雷达物位计一样属于非接触式测量仪表,但是其由向被测目标发射超声波脉冲来计算物位距离的,属于微处理器控制的数字液位仪表。超声波液位计与雷达物位计还有什么不同之处吗?当然有,先由电磁波说起。
电磁波的波段一般在范围3kHz~3000GHz内,波段较宽,而微波则是指频率为300MHz~300CHz的电磁波。在物位测量仪器仪表中,微波使用的频段约在4~30GHz之间,其中,波段为5.8GHz、10GHz、24GHz与5.8GHz的频率属于C波段微波;波段为10GHz的频率属于X波段微波;波段为24GHz的频率属于K波段微波。
(导波雷达液位计eh)

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